Heterocyclic compounds and method



United States Patent HETEROCYCLIC COMPOUNDS METHOD FOR PRODUCING SAlVIE Karl Hoffmann and Ernst Urech, Binningen, Switzerland,

fig??? to Ciba Pharmaceutical Products Inc., Sumt, v i

No Drawing. Application May-22, 1957 V, SerialNo.'660,743

Claims priority, application Switzerland Mann 3; 1 954 Claims. 01. 260-327) This is a continuation-in-part of our copending application, Serial No. 489,306, filed February 18, 1955 now abandoned.

This invention relates to ll-unsubstituted IO-(tertiary aminoalkyl) dibenzo [b:f] thia [1] aza [4] cycloheptadie'ne-[2:6l-compounds having the general formula and salts, such as acid addition salts or quaternary ammonium salts thereof. A in the above general formula represents a lower alkylene radical and R and R represent, interchangeably, lower alkyl or cycloalkyl radicals, andwhen taken together, loweralkylene or lower monooxaalkylene radicals, preferably those containing 4 to 5 carbon atoms. 'The positions 1 to 4 and 6 to 9 may be unsubstituted or substituted, that is to say,'R and R mayjrepresent, interchangeably, hydrogen, halogen,fi. e. chloro, bromo, fluoro or iodo; amino; lower. alkyl and lower alkoxy groups.

The tertiary aminoalkyl radical, of which the alkylene chain may be straight or branched, is preferably a tertiary amino lower alkyl radical. more especially an amino group disubstituted by alkyl, e. g. lower alkyl and/or cycloalkyl radicals or an amino group disubstituted by an alkylene radical which may, if

2,852,528 Patented Sept. 16, 1958 "ice are obtained in the form of their bases, acid addition salts, or quaternary ammonium salts. From the salts there can be obtained in the usual manner the free amines or ammonium bases. From the amines or ammonium bases salts can be obtained by reaction with acids which are suitable forthe formation of therapeutically useful or non-toxic salts, for example, hydrohalic acids, sulfuric acid, nitric acid, phosphoric acid, thiocyanic acid, acetic acid, propionic acid, oxalic acid, malonic acid, succinic acid, malic acid, methane sulfonic acid, ethane sulfonic acid, hydroxyethane sulfonic acid, benzene or toluene sulfonic acid or therapeutically active acids.

The starting materials, namely, the IO-(tertiary-aminoalkyl) -11- oxo dibenzo [bzf] thia- [1] aza [4]- cycloheptadiene-[2z6] compounds are new. In general,

1 they can be prepared by reacting an 11-oxo-dibenzo-[b:f]-

The tertiary amino group is desired, be interrupted by a hetero atom such as oxygen.

Such aminoalkyl radicals are, for example, dimethylamino-, diethylamino-, pyrrolidino-, piperidino-, or morpholino-ethyl, -propyl, -isopropyl, butyl, -isobutyl or -pentyl groups.

As quaternary ammonium salts there may be men tioned, more especially, lower alkyl ammonium salts, for example, lower alkyl ammonium halides, e. g. methyl, ethyl, propyl and butyl ammonium chlorides.

The new basically substituted heterocyclic compounds which comprise the invention possess an antihistaminic ctfect and are useful as antihistamines. They can be administered in any suitable manner, for example orally, in combination with an adjuvant as a carrier to facilitate the administration thereof.

The new compounds are prepared by reducing the 0x0- groups in a l0-(tertiary-aminoalkyl)-ll-oxo-dibenzo- [bzf] thia [ll aza [4] cycloheptadiene [2:6]- compound with a reducing agent, the tertiary aminoalkyl radical being the same as hereinabove described. The reduction of the 0x0 group is carried out, for example, with a complex metal hydride, such as lithium aluminum thiall-aza- [4l-cycloheptadiene- [2: 6] which is unsubstituted in the l0-position with a reactive ester of a tertiaryaminoalkanol, e. g., a tertiary-aminoalkyl halide. The novel starting materials and the method for preparing them are described and claimed in our application Serial No. 489,305, filed on February 18, 1955.

The l l-oxo-dibenzo- [b :fl -thia-[ ll-aza- [4] -cycloheptadime-[2:6] compounds, in turn, are prepared by intramolecularly condensing by heating in the absence of an acid condensating agent, N-unsubstituted 2-amino-diphenyl-sulfide-2-carboxylic acids or lower alkanol esters thereof,

The new compounds are useful as medicaments, for example in the form of pharmaceutical preparations, which contain the new compounds or salts thereof in admixture with a pharmaceutical organic or inorganic solid or liquid carrier suitable foreuteral, parenteral or topical administration. For making up the preparations there can be employed substances which do not react with the new compounds, such for example, as water, gelatine, lactose, starches, magnesium stearate, talc, vegetable oils, benzyl alcohols, gums, polyalkylene glycols, petroleum, cholesterol or any other known carrier for medicaments. The pharmaceutical preparations may be, for example, in the formof tablets, dragees, salves, creams or in liquid form as solutions, suspensions or emulsions. If desired, they may be sterilized and/ or contain auxiliary substances, such aspreserving agents, stabilizing agents, wetting or emulsifying agents, salts for varying the osmotic pressure or butters. They may also contain other therapeutically useful substances.

The following examples illustratethednvention, the parts being by weight unless otherwise stated and the relationship of parts by weig'ht to parts by volume being the same as that of the gram to the cubic centimeter:

Example 1 In a flask fitted with stirring mechanism with an extraction device and with a reflux condenser 11.4 parts of lithium aluminum hydride in 1000 parts by volume of absolute ether are heated at the boil so that the refluxing ether dissolves out in the course of 2-3 hours 29.8 parts of lO-(fl-dimethylamino-ethyl) -111 oxo-dibenzo [bzf] thia [l] aza-[4]-cycloheptadiene-[2:6] which is in the extraction device. After beingheated for a further 3 hours, the reaction mixture is cooled in ice, mixed with a small quantity of water, and then filtered with suction. After being dried over potassium carbonate, the ethereal solution is evaporated and the residue is recrystallized from a small amount of hexane. There is obtained in very good yield l-(flrdimethylamino ethyl) E dibenzo [bzf] thia [l] aza [,4]- cyclo-heptadiene l2:6] of the formula e eea A solution of 3.0 parts of lithium aluminum hydride in 200 parts by volume of absolute ether is mixed at 25-35 C. in the course of 30 minutes with a solution of 13.2 parts of l0-(fi-diethylarnino-ethyU-l l-oxo-dibenzo [bzfl thia [1] aza [4] cycloheptadiene- [2:6] in 50 parts by volume of ether, and the mixture is maintained at the boil for a further 4 hours. The whole is cooled with ice, a small quantity of water is added, and the ethereal solution is filtered with suction. After drying the solution over potassium carbonate, the ether is distilled oil and the residue is distilled in a high vacuum. There is obtained in good yield 10-(5-diethylamino ethyl) dibenzo [b:f] thia [l] aza [4]- cycloheptadiene-[2:6l of the formula C 2- C FN( CzHs):

in the form of a pale yellow oil boiling at 152-158" C. under 0.18 mm. pressure. It is easily soluble in the usual organic solvents. Its methane sulfonate, which is prepared by the addition of methane sulfonic acid in ethyl acetate, melts at 139-141 C. Itis easily soluble in water, whereas the neutral oxalate prepared by adding oxalic acid in alcohol, melting at 159-161" C. is only slightly soluble therein. a

X mgile 3 6.4 parts of lithium aluminum hydride, dissolved in 350 parts by volume of absolute ether, are mixed in the course of 5.0 minutes at 25-30 C. with a solution of 29.0 parts of l01,(q diethylarnino-propyl)-1l-oxo dibenzo- [bzf] thia [1] aza [4] cycloheptadiene [2:6] in 150 parts by volume of ether, and the whole is heated at the boil for 4 hours. After cooling the mixture with ice, a small quantity of water is added, the ethereal solution filtered with suction, dried over potassium carhonate and the ether is evaporated. The. residue oil is qi l ll jqi h rsb Q-(v t sminq Pr el-a ms 4 [b2fl-thia-[1l-aza-[4l-cycloheptadienc [2:6] formula of the C rG PCHr-N( 2 a)s is obtained in the form of a pale yellow oil boiling at 178-182 C. at 0.2 mm. pressure. The hydrochloride, which is prepared by the addition of hydrochloric acid in ethyl acetate, melts at 109-111" 'C.

Example 4 cmcmomm which, when recrystallized from hexane or isopropyl ether, yields colorless crystals melting at 38 C. The h d chl ride e ared as d scri sd i Exam e 3 m lts at 162-164" C. It dissolves easily in water.

Examp 5 By working in the manner described in Example 1, there is obtained from 31.2 parts 'of 10-( fl-dimethyla'mino- B methyl ethyl) 11 oxo dibenzo [b:fl thial1l-aza-[4]-cycloheptadiene-[2z6] melting at 110-112 C., IO-(B-dimethylamino ,8 methyl ethyl) dibenzo- [bzfl thia [1] aza [4] cycloheptadiene [2:61

of the formula V CH1 clir i -N (9E1 in the form or a pale yellow .oil boiling at 118-1 875 C. under 0.3 mm. pressure. Its hydrochloride prepared a e r e i x p e 3 mel s at 1801 .82 s.

Ex mpl 6 A solution of 5.6 p rts of lithium aluminum hydride in 375 parts by volumeof absolute other is mixed at 25-30 C, in the course of 50; minutes with a solution of pa o h e- -(m i y m o-prop lhl1: oxo-dibenzo- [b:f] thia [11 aza [4] cycloheptais 2= n 0 pa by volum o the and 50 Pa ts by volume of tetrahydrofurane, and the reaction mass is heated at the boil for a further 4 hours. It is then qol d t e a mal am nt r wat s a d the mixture is filtered with suction, the filter residue is washed well with ether, and the combined solutions are evaporated to dryness. The residue is crystallized vfrom a mixture of pentan e and isopropyl ether (1:1), and a treaties I melt n at 7, 7 Q- shtainsd. sen.-

NASH

There can be obtained therefrom according to the directions given in Example 3 a hydrochloride melting at 189-191" C.

Fraction II is a free from oxygen and is 8-chloro-10- ('y-dimethylamino-propyl) dibenzo [b:f] thia [1] aza-[4l-cycloheptadiene-[2:6] of the formula Its hydrochloride prepared as described in Example 3 melts at 135-137 C.

Example 7 A solution of 18.8 parts of 8-chloro-10-(q-diethylamino. propyl) ll oxo dibenzo [bzf] thia [1] aza- [4l-cycloheptadiene-[226] in 100 parts by volume of absolute ether is run in the course of 75 minutes into a boiling solution of 5.7 parts of lithium aluminum hydride in 450 parts by volume of absolute ether, and the mixture is boiled for 5 hours under reflux.' The mixture is cooled with ice, a small quantity of water is added thereto, and the ether is filtered off with suction. The ethereal solution is dried with potassium carbonate and evaporated to dryness. The resulting oil is crystallized from a small amount of hexane or isopropyl ether, and yields 8-chloro ('y diethylamino-propyl) -dibenz'o- [bzf] thia [l] aza [4] cycloheptadiene [2:6 of the formula 1 CHrCHrCHtr-N(C2H5)2 CIE I I \S in the form of colorless crystals melting at 37-38 C.

In an analogous manner there are obtained from the corresponding ll-oxo-compounds:

Example 8 7-chloro 10 (/3 diethylamino-ethyl)-dibenzo-[bzflthia [1] aza [4] cycloheptadiene [2:6] boiling at l78-l88 C. under 0.17 mm. pressure of mercury.

Its methane sulfonate prepared as described in Example 2 melts at 134138 C.

Example 9 Example 10 6 chloro 10 ('y dimethylamino-propyl)-dibenzo- [bzfl-thiaU]-aza-[4]-cycloheptadiene-[2z6] boiling at 175 184" C. under 0.17 mm. pressure of mercury. Its

hydrochloride prepared as described in Example 3 melts at 137 C.

r The starting materials used in the examples given hereinbefore are prepared as follows:

Example A 22.7 parts of 11 oxo dibenzo [b:f]- thia [1]-aza- [4] cycloheptadiene [2:6] and 5 parts of sodamide are heated with 250 parts by volume of dioxane for 90 minutes at the boil, during which ammonia is evolved. A solution of 13 parts of fi-dimethylamino-ethylchloride in dioxane is then added in the course of one hour at the boil, and the mixture is boiled for a further 2 hours. After the reaction, the excess of sodamide is decomposed by the addition or a small amount of alcohol. The reaction mass is then filtered with suction, the filtrate evaporated to dryness and the residue is recrystallized from ethyl acetate. In this manner there is obtained IO-(fl-dimethylaminoethyl) 11 oxo dibenzo [bzf] thia [l] aza- [4] cycloheptadiene [2:61 of the formula CHrCHrNws):

Example B 22.7 parts of 11 oxo dibenzo [b:f] thia [1]-aza- [4] cycloheptadiene [2:6] and 5 parts of sodamide are heated in 400 parts by volume of xylene at the boil until the evolution of ammonia ceases. A solution of 20 parts of fi-diethylamino-ethyl chloride in xylene is run in, in the course of 2 hours, and the whole is heated for a further 2 hours at l20-l35 C. After being cooled to about 80 C., the reaction mass is then filtered with suction and the xylene is distilled off in vacuo. The residue is dissolved in dilute hydrochloric acid, the solution is extracted with ether, and the aqueous solution is mixed with alkali. The base which separates is dissolved in ether, the ethereal solution is dried over potassium carbonate and evaporated. By distillation there is obtained in good yield a fraction boiling at -170 C. under 0.18 mm. pressure in the form of a pale yellow oil. It is IO-(B-diethylamino-ethyl) 11 oxo dibenzo [bzf] thia [llaza-[4]-cycloheptadiene-[2:6] of the formula A solution of the base in ethylv acetate yields on the addition of the calculated quantity of alcoholic hydro-.

chloric acid the colorless hydrochloride melting at 168- 170 C, It is easily soluble in water.

Example C hlo de in: discus at the c lin empsram e d boiled ora hours he; exce s. of sodamide: is h n. decomposed with a small amount of alcohol; the reaction mixture is. filtered with suction and, the filtrate is evaporated to dryness. The residue is. dissolved. in dilute hydrochloric acid, a small amount of neutral substances is extracted from this solution with ether, and the base so obtained is precipitatedfromthe acid solution by means of -alkali. This base is taken up in ether and the ether is distilled olf, after drying the solution over potassium carbonate. The residual. oil is distilled in a high vacuum, whereby 10 diethylamino propyl) 11 x0 dibenzo- [bzf] thia [1] aza [4] cycloheptadiene- E2:6] ofithe-formula Hk-QE ENW W passes over in the form of a yellowish thick oil boiling at 182-188 C. under a pressure of 0.18

The hydrochloride obtained in ethyl acetate with the aid of alcoholic hydrochloric acid isa colorless crystalline powder melting at 148-150" C., which is easily soluble in water.

erm a in the form of colorless crystals melting at 761-78' C. .The'hydrochlori'de prepared as described in Example B','is recrystallizedfrom a mixture of ethyl acetate and alcohol. It melts at 127-198 C. It is easily soluble in water.

Emmal E 56.7 parts of 1l-oxo-dibenzo-[bcfli-thia-t1l-aza-[4lcycl0heptadiene-[2z6] are heated at the boil with 12.5 parts of sodamide in 550; parts of dioxane until the evolution of ammonia ceases. The dioxane solution of 38.0 parts 'of fi-dimethylamino-u methyl-ethyl chloride is introduced dropwise in the course of 90-minutes, and then the Whole is heated at the boil for a further 2 hours. When the reaction hasceased, a small amount of methanol is added and the warm reaction mass is filtered with suction. The filtrate is evaporated to dryness and the evaporation residue is crystallized from 3 parts by volume of hexane, whereby 63. parts of a crystallizate melting at 106-ll0 C are obtained. Further recrystallization ofthis fraction raises the melting point to 110- l 1-2-' C; It is l0-(fl-dimethylamino-fl-methyl-ethyl) 11- oxodibenzo ['bzf] thia [l] aza [41- c-ycloheptacliche-E226] of the Formula I. A further fraction havirr'g-v a; lower melting, point is lo-(fi-dimethylamino-a- 8 methyl ethyl) ll oxo dibenzo [blf] thia [l]- aza-[4l-cycloheptadiene-[2:6] of the Formula II The hydrochloride of the Base I prepared as described in Example A when recrystallized from isopropanol melts at 15 0-15 2 C. It is easily soluble in 'water.

Example F 8 chloro 1O dimethylamino. propyl) t1;- oxo dibenzo [hzf]. thia E l] aza [41 cycloheptas dime-[2:6] of the formula is obtained in the form of colorless crystals melt g; t. Ill-137 C. (recrystallized from isopropyl ether) by the procedure described in Example A, but using 39.3 parts of 8-chloro-11-oxosdibenzo-[bzfl-thiad 1 -.a'za-.[4] -cycloheptadiene- [2:61, 7.5 parts of sodamide, 375 parts byvol ume of dioxane and 23.8 parts of y-dimethylaminm The. hydrochloride is prepared from the base by neutralizing a solution in ethyl acetate with the calculated quantity of alcoholic hydrochloric acid. It melts at 172 174 C. and dissolves well in water.

Example G 8 chloro 1 0 ('y. diethylaminopropy-l) l1 -.o x odibenzo [bzf] thia [11 aza [4] cycloheptadiene [2:61 melting at 5153 C. is, prepared as describedin Example 6 by using, instead of fi-dimethylamino-ethyl chloride, 28.0 parts of 'y-diethylamino-propylchloride. The base can be recrystallized from hexane. It has the following formula The hydrochloride is obtained by neutralizing a solution of the base in isopropanol with the calculated quantity of alcoholic hydrochloric acid. It melts at l86-188 C.

Example H 39.3 parts of 7'-chloro-l l-oxo-dibenzo-[b:fl-thia-[l]- aza- [4]:cycloheptadiene-[Zfi], 7.5 parts of sodamide and 26.4 parts of diethylamino-ethyl chloride in dioxane are reacted in the manner described in Example F. There is obtained 7-chloro-l-O-(fi-diethylamino-ethyl)-11-oxodibenzo- [b f] -thia-[ Il-aza- [4] -cycloheptadiene- 2 6] of the formula as a thick oil boiling at 190-193 C. under 0.17 mm. pressure of mercury. With dilute hydrochloric acid the somewhat difficultly soluble hydrochloride melting at 232-235 C. with decomposition is obtained. The methane'sulfonate, which is prepared in ethylacetate-ether, melts at 95-98" C. It is easily soluble in water.

Example I CHPCHI-CHgNU JHQ ll N-C oil I )9 in the form of colorless crystals melting at 113-115 C. The hydrochloride prepared in ethyl acetate by the addition of the calculated quantity of alcoholic hydrochloric acid is a colorless crystalline powder meltin at 182- 184" C.

Example I If instead of 8-chloro-11-oxo-dibenzo- [bzf] -thia-[1]- aza-[4l-cycloheptadiene-[2:6] as in Example F, 6-chloro- 11- oxo dibenzo [bzfl thial1] aza [4] cycloheptadiene-[2z6] is used,'there is obtained the 6-chloro- ('y dimethylamino propyl) l1 oxo dibenzo [bzfl-thia-E1l-aza-l4]-cycloheptadiene-[2:6] of the formula CHr-CHr-CHgN(CHa)s oxo-compounds used as starting materials in Examples A-J can be prepared as follows:

Exampl. 1

129.5 parts of Z-amino-diphenylsulfide-T-carboxylic acid methyl ester are heated in a bath having a temperature of 245250 C. for 40 minutes while distilling oil the methyl alcohol formed and for a further 40 minutes under reduced pressure at the same temperature. In this manner the melt becomes solid. After being cooled, the crystalline mass is extracted at the boil with ethanol, disintegratedand filtered with suction in the cold. There is obtained in very good yield ll-oxo-dibenzo-[bzflthia-[1]-aza-[4]-cycloheptadiene-[2:6] of the formula H 0 at in the form of colorless crystals melting at 257-259 C.

"The" new compound can be recrystallized from glacial acetic acid or methyl ethyl ketone.

The reaction period can be considerably shortened by increasing the temperature to 280 C. Instead of the methyl ester there may be used another ester,'for example, the ethyl or propyl ester.

Example 11 147 parts of 2-amin0-4-chloro-diphenylsulfide-T-carboxylic acid methyl ester are heated forB O minutes under atmospheric pressure andfor one, hourunder reduced pressure in an oil bath at 245250 C. the melt becoming crystalline throughout. After being cooled, the mass is extracted at the boil with 500 parts by volume of ethyl acetate, disintegrated and filtered with suction in the cold. There is obtained in very.good yield 8 chloro 11 oxo dibenzo [bzf] thia [1] aza [4]-cycloheptadiene-[2:6l of the formula ill) in the form of colorless crystals melting at 294-298 C., which can be recrystallized from dimethyl-formamide.

, The 2-amino-4-chloro-diphenyl su1fide-2'-carboxylic acid methyl ester used as starting material in this example may be prepared, for example, by introducing 2,5- dichloro-nitrobenzene into a boiling solution of sodium thiosalicylic acid methyl ester in methanol in the presence of a copper catalyst, and then reducing the resulting ultra-compound for example, catalytically. It melts at 136-137C. 1

Eqcample Ill 7 24.5 parts of 2'- amino+dipheny1-sulfide-2-carboxylic acid are heated for 30-60 minutes in an oil bath at 150- 2Q0QC. The resulting ll-oxo-dibenzo-lbzf]-thia-[1]- aza [4] cycloheptadiene-[2: 6] melting at .257259 C. is identical with thecompound obtained in Example 1.

Example IV It in Example 11, Z-amino-S-chloro-diphenyl-sulfide- 2- carboxylic acid methyl ester is used in the place of the 2-amino-4-chloro-compound, there is obtained 7- chloro- 11- oxo diben'zo [b:f1- thia [1] aza [4] cycloheptadiene-[2z6l of'the formula as colorless crystals melting at 316-320 C.

lized from dimethyl formamide).

The above starting material can be obtained for ex- (crystalample, by reacting 2,4-dichloro-nitrobenzene with a so- S l I,

melting at 28 8 290 Q. as a colorless crystalline powder (from dimethyl tormamide)- Example- 11 To a solution, of 5.4 grams of lithium-aluminum hydride in 450 cc. of absolute ether is added at 20;-221 C., while stirring vigorously, in the course of one hourthe solution of 15' grams of 8-methy1-10-(fl-dimethylaminoethyl) l1-oxo-dibenzo-Eb:f]-th.ia-[1] aza-E]-cycloheptadiene-[2z6] in 40 cc. of absolute dioxane, and the mixture is maintained at the boil for a further hours.

The Whole is cooled with ice, a small amount of water is added, and the ethereal solution is filtered with suction. After drying the ethereal solution over potassium carb0nate, the ether is distilledotf and the residue is distilled in a high vacuum. There is obtained 8-methyl-(fi-dimethylaminoethyl) dibenzo-[bzfl-thia-l'l]-aza-[4]-cycloheptad-iene- [2:6] oftheformula in the form of a pale yellow oil boiling at152-160" C. under 0.01 mm. pressure The; hydrochloride, prepared in a mixture, of alcohol and ethyl acetate, melts atv 173- 175; C. It contains one molecule of'water of crystallization and; dissolves Well in water. The 8-methyl7-10- (fi-d inethyl'aminoethyl) 1'1 -0XO-d lbDZO -Ebif] -thia-[1]- aza- [Mg-cycloheptadiene-[2:6] used as starting material; can be obtained, for example, by condensing 28 grams of 8 methyl ll-oxo-dibenzo-[bzf]-thia-[1]-aza-[4]- cycloheptadiene-[2r6] with 22.4 grams of fl-dimethylamiuoethylj chloride with the aid of 64 grams of sodamide, as described in the copending application, Serial No; 660,742, filed May 22', 1957.

c 8- methyl- 1 1 oxo-dibenzo-[bzfJ-thia-[l]-aza-[4]- cycloheptadiene-[2:6] can be obtained bycondensing 112 grams of thiosalicylic acid methyl ester with 135 grams of 3-nitro-4-chlorotoluene in the presence of 17 grams of sodium in 30Q cc, of methanol, reducing the resulting 2-nitro-4-methyl-diphenyl sulfide-2'-carboxylic acid methyl ester with hydrogen in the presence of a nickel catalyst and ling. closure of the amino-compound at 240-270 C., as described in the copending application, Serial No. 660,742 filed May 22, 1957.

In ananalogous-manner the following-compounds are prepared:

S-methyl 1 0 (,8 diethylaminoethyD-dibenzo-[bzflthia-i 1 ]-aza- [4].-cycloheptadiene-.[2: 6] from 8 methyllodfi dimethylaminoethyl) 11 oxo-dibenzo-[b:f] -thia- ['1] -aza- [4i] -cycloheptadiene- [2 6] V 8.-methyl-LO-(B-N-isopropyl N methylaminoethyl), dibenzo- [1b f] -thia- E 1 r-aza ['4] cycloheptadiene-[216] from. 8 methyl-l0a(}3-N-isopropyl-N-methylaminoethyl)- 1 l-oxo-dibenzoh :f] -thia-[ 1 -aza- [4] cycloheptadiene- [2:6];

8rmethyl-lO5('y-dimethylaminopropyl) dibenzo-[bzflthia-[ll-aza-[4]-cycloheptadiene [2:6] from 8-methyle lfl-(t t-dimethylaminopropyl') -1-1:-oxo-dibenzo- [-b:f]; thia- [1:] aza--[41 cycloheptadiene- [2 6] 7 methyl=-(fl-dimethylaminoethyl) dibenzos- [bzf l-r thiastniaza:[41-cyel ept d cn -[2:61 f om -me hy1.- fls (fir-l d methy aminqethyl)rlilxo dihenz -l flrthim [1;] -aza,- [4] -cycloheptadiene- [2:6]

6,-methyl-10r(fldimethylaminoethyl); dibenzo -r. [b:f].-. thia-i1l-azar[4.lecycloheptadiene [2:.6]. from. 6.-methyl.-. 10- (fi-dimethylaminoethyl) .-1 1-oxo-dibenzo- [b f]? thia: 1 -aza- [4] -cycloheptadie ne- [2: 5]

7 :8 dimethyl 10 (p dimethylaminoethyD-dibenzob fl-thia- 1 -aza- [4'] -cyclohept-adiene- [2: 6] from 7: 8- dimethyl 10 (5- dimethylaminoethyD-l I-oxo-dibenzo- [b f] -thial l-aza- ['4] -cycloheptadiene- [2: 6]

S-methoxy-lO-(fi-diethylaminoethyl) dibcnzo [bzflthia- 1 l-aza- [4l-cycloheptadiene- [2 6] from S-methoxylO-(fl-diethylaminoethyl) l1 oxo dibenzo-[b:f]-thia- 1]-aza-[4]-cyc1oheptadiene-[2:6]

8 methoxy 10 s dimethylaminopropyl)-dibenzo- [bzfl-thia-[ll-aza- [4] cyclpheptadiene [2:6] from 8- methoxy-lO-(q -dimethyIBmiiJOPrO yIJ 11- oxo-dibenzo- [bzfl-thia-E 1 -aza- [4] -cycl'oheptadiene-[2:6].

The starting materials can be obtained by the process de bed in e: con edin pplication: Serial-Ne. 666952 27; fi ed Q c rr nt1yhe ewi h-.

What isclaimedis;

1 Av memberof the,

group; consisting of cycloheptaa diene compounds of the general formula wherein A stands for a lower alkjylene radical, R and R represent members selected from the group consisting of lower alkyl and, when taken; together, morpholino and lower alkylene radicals containing 4 to 5 carbon atoms, and R and R represent, interchangeably, a member of the group consisting of hydrogen, halogen, amino, lower alkyl and lower alkoxy substituents, and therapeutically useful acid addition salts and therapeutically useful lower alkyl a quaternary ammonium halide salts thereof where in the nitrogeniatomcai-ryingthe R and R substituents; is quaternized.

2; -L (3-. dimclhylamiuoethylJ dibenzo [:b-zflthia ['lt] aza -1 ['41]: cycloheptadiene -4 [2:6] 01":- the formula HFQEFN H1) 4; 1'01 (:5 dimethylamino -.,8,:-vmethyh ethyl): s di-,

UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No. 2,852,528 September 16, 1958 Karl Hoffmann et a1 It is hereby certified that error appears in the-printed specification of the above numbered patent requiring correction and that the said Letters Patent should read as corrected below.

Column 8, line 31, for "111-437 00" read m 111=113 0., a

Signed and sealed this 23rd day of December 1958,

(SEAL) T Attest:

KARL H, AXLINE ROBERT C. WATSON Attesting Ofiicer Commissioner of Patents 

1. A MEMBER OF THE GROUP CONSISTING OF CYCLOHEPTADIENE COMPOUNDS OF THE GENERAL FORMULA 